Classification
330 - Economics
142
333 - Economics of land & energy
33
320 - Political science
27
658 - General management
26
380 - Commerce, communications & transportation
17
363 - Other social problems & services
16
900 - History & geography
16
000 - Computer science, information & general works
14
700 - The arts; fine & decorative arts
13
140 - Specific philosophical schools
11
340 - Law
9
100 - Philosophy & psychology
8
600 - Technology
8
300 - Social sciences
7
174 - Occupational ethics
5
350 - Public administration & military science
5
370 - Education
4
338 - Production
3
339 - Macroeconomics & related topics
3
361 - Social problems & social welfare in general
3
551 - Geology, hydrology & meteorology
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
657 - Accounting
3
004 - Data processing & computer science
2
158 - Applied psychology
2
170 - Ethics
2
297 - Islam, Babism & Bahai Faith
2
301 - Sociology & anthropology
2
302 - Social interaction
2
305 - Social groups
2
332 - Financial economics
2
500 - Natural sciences & mathematics
2
530 - Physics
2
540 - Chemistry & allied sciences
2
800 - Literature & rhetoric
2
160 - Logic
1
200 - Religion
1
303 - Social processes
1
304 - Factors affecting social behavior
1
331 - Labor economics
1
336 - Public finance
1
337 - International economics
1
362 - Social welfare problems & services
1
368 - Insurance
1
382 - International commerce
1
383 - Postal communication
1
398 - Folklore
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
more ...